diff --git a/vimrc b/vimrc
index c5a2340..31d5036 100644
--- a/vimrc
+++ b/vimrc
@@ -120,3 +120,17 @@ function! <SID>SynStack()
   endif
   echo map(synstack(line('.'), col('.')), 'synIDattr(v:val, "name")')
 endfunc
+
+" use <tab> to trigger completion and navigate to the next complete item
+function! CheckBackspace() abort
+  let col = col('.') - 1
+  return !col || getline('.')[col - 1]  =~# '\s'
+endfunction
+
+inoremap <silent><expr> <Tab>
+      \ coc#pum#visible() ? coc#pum#next(1) :
+      \ CheckBackspace() ? "\<Tab>" :
+      \ coc#refresh()
+
+inoremap <expr> <Tab> coc#pum#visible() ? coc#pum#next(1) : "\<Tab>"
+inoremap <expr> <S-Tab> coc#pum#visible() ? coc#pum#prev(1) : "\<S-Tab>"